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December Weather in De Kalb, United States

Last updated: June 24, 2025

In December, the average temperature in De Kalb, United States hovers around 11°C (51°F). Expect a temperature range that can dip to a brisk -4°C (25°F) and soar to a pleasant 26°C (80°F). During this month, anticipate 120 mm (4.7 in) of precipitation spread over approximately 12 days, with the air carrying a humid average of 88%. Prepare accordingly for this mix of conditions!

December Temperature in De Kalb

In December in De Kalb, the average temperature is 11°C (51°F). Maximums can reach 26°C (80°F) and minimums can be as low as -4°C (25°F). Be prepared for a wide range of temperatures when traveling, so pack accordingly!

December Weather in De Kalb: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in De Kalb, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In De Kalb, December typically has an average temperature of 11°C (51°F), with highs reaching up to 26°C (80°F) and lows dropping to around -4°C (25°F).
JanFebMarAprMayJunJulAugSepOctNovDec485360647379818177685451
Data source: Temperature data for De Kalb generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in De Kalb

In De Kalb in December, the precipitation amount is 120 mm (4.7 in) over a period of 12 days.

December Precipitation Trends in De Kalb

The chart displays monthly precipitation patterns in De Kalb, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In De Kalb, December typically receives around 120 mm (4.7 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec1051601201481201671091299710966120
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in De Kalb

In De Kalb in December humidity is 88%. With an average temperature of 11°C (51°F), this humidity feels like traveling through a damp, heavy blanket, making every step slightly more laborious and the air thick with moisture, which can be quite uncomfortable for exploration.

December Average Humidity in De Kalb

This chart illustrates the average monthly humidity levels in De Kalb, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in De Kalb is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%84%82%82%82%79%82%77%74%73%85%88%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in De Kalb

In De Kalb in December, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in De Kalb for better planning.

Maximum UV Index Levels in De Kalb for December

The chart shows the monthly maximum UV Index (UVI) for De Kalb in December, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In December, the maximum UV index in De Kalb typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec47810111111119864
Data source: De Kalb December UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How December Weather in De Kalb Compares to Other Months

Weather in De Kalb varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in De Kalb, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in De Kalb, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather9°C (48°F)105 mm (4.1 inches)85%moderate
February Weather12°C (53°F)160 mm (6.3 inches)84%high
March Weather15°C (60°F)120 mm (4.7 inches)82%very high
April Weather18°C (65°F)148 mm (5.8 inches)82%very high
May Weather23°C (74°F)120 mm (4.7 inches)82%extreme
June Weather26°C (79°F)167 mm (6.6 inches)79%extreme
July Weather27°C (81°F)109 mm (4.3 inches)82%extreme
August Weather27°C (81°F)129 mm (5.1 inches)77%extreme
September Weather25°C (78°F)97 mm (3.8 inches)74%very high
October Weather20°C (69°F)109 mm (4.3 inches)73%very high
November Weather12°C (55°F)66 mm (2.6 inches)85%high
December Weather11°C (51°F)120 mm (4.7 inches)88%moderate

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